27 April 2009 Measurement of a subsystem of a coupled quantum system
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Abstract
The Stern-Gerlach (SG) apparatus for measuring the spin of an uncharged spin-1/2 particle is the archetypal quantum sensing device. We study this device for the new problem of measuring the spin of a particle that is coupled externally to another particle. Specifically, we treat two coupled particles in which a single particle is measured by the SG device while the other is not. We show simulations of how the binding energy associated with the external coupling is completely converted to potential energy and kinetic energy as the single particle separates spatially within the magnetic field of the SG device. Additionally we show simulations of how the initial particle acceleration within the SG devices relates to the coupling, the quantum state of the two-particle system, and the initial spatial dispersion of the particle within the SG device. The results of our analysis, though obtained specifically for the SG apparatus, may be generic to other quantum measurement devices with similar external coupling.
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M. Steiner, M. Frey, A. Gulian, R. W. Rendell, A. K. Rajagopal, "Measurement of a subsystem of a coupled quantum system", Proc. SPIE 7342, Quantum Information and Computation VII, 73420F (27 April 2009); doi: 10.1117/12.817558; https://doi.org/10.1117/12.817558
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